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Early Stage in the Evolution of the Paleoasian Ccean at the Western Margin of the Siberian Craton : Geochemical and Geochronological Evidence. / Likhanov, I. I.; Zinoviev, S. V.
In: Geochemistry International, Vol. 56, No. 2, 01.02.2018, p. 111-124.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Early Stage in the Evolution of the Paleoasian Ccean at the Western Margin of the Siberian Craton
T2 - Geochemical and Geochronological Evidence
AU - Likhanov, I. I.
AU - Zinoviev, S. V.
N1 - Publisher Copyright: © 2018, Pleiades Publishing, Ltd.
PY - 2018/2/1
Y1 - 2018/2/1
N2 - The discovery of glaucophane relicts in the high-pressure tectonites of the Yenisei suture zone of the Yenisei Ridge suggests the manifestation of the “Chilean-type” convergent margin on the western Siberian Craton, which was controlled by subduction of oceanic crust beneath the continental margin. These rocks are restricted to the tectonic suture between the craton and the Isakovka ocean-island terrane and experienced two metamorphic stages. Petrogeochemical characteristics of the mafic tectonites indicate that their protoliths are N-MORB and E-MORB basalts. More primitive N-MORB basalts were formed at the initial spreading stages through melting of the upper depleted mantle. Higher Ti basalts were formed by melting of enriched mantle protolith at the later spreading stages. U–Pb zircon age of 701.6 ± 8.4 Ma of the metamorphosed analogues of normal basalts marks the initiation of oceanic crust in the region. Revealed sequence of spreading, subduction (640–620 Ma), and shear deformations (~600 Ma) records the early stages in the evolution of the Paleoasian ocean in its junction zone with the western margin of the Siberian craton: from formation of fragments of oceanic crust to the completion of accretionary–subduction events.
AB - The discovery of glaucophane relicts in the high-pressure tectonites of the Yenisei suture zone of the Yenisei Ridge suggests the manifestation of the “Chilean-type” convergent margin on the western Siberian Craton, which was controlled by subduction of oceanic crust beneath the continental margin. These rocks are restricted to the tectonic suture between the craton and the Isakovka ocean-island terrane and experienced two metamorphic stages. Petrogeochemical characteristics of the mafic tectonites indicate that their protoliths are N-MORB and E-MORB basalts. More primitive N-MORB basalts were formed at the initial spreading stages through melting of the upper depleted mantle. Higher Ti basalts were formed by melting of enriched mantle protolith at the later spreading stages. U–Pb zircon age of 701.6 ± 8.4 Ma of the metamorphosed analogues of normal basalts marks the initiation of oceanic crust in the region. Revealed sequence of spreading, subduction (640–620 Ma), and shear deformations (~600 Ma) records the early stages in the evolution of the Paleoasian ocean in its junction zone with the western margin of the Siberian craton: from formation of fragments of oceanic crust to the completion of accretionary–subduction events.
KW - geochemistry
KW - high-pressure tectonites
KW - Paleoasian ocean
KW - protolith
KW - U–Pb and Ar–Ar dating
KW - Yenisei Ridge
KW - AL-RICH METAPELITES
KW - COMPLEX
KW - COLLISIONAL METAMORPHISM
KW - U-Pb and Ar-Ar dating
KW - YENISEI-RIDGE
KW - BASALTS
KW - MAGMATISM
KW - TRANSANGARA REGION
KW - FE-RICH
KW - AGE
KW - RANGE
UR - http://www.scopus.com/inward/record.url?scp=85042290524&partnerID=8YFLogxK
U2 - 10.1134/S0016702918020040
DO - 10.1134/S0016702918020040
M3 - Article
AN - SCOPUS:85042290524
VL - 56
SP - 111
EP - 124
JO - Geochemistry International
JF - Geochemistry International
SN - 0016-7029
IS - 2
ER -
ID: 10453009